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I admired virtue and good feelings and loved the gentle manners and amiable qualities of my cottagers, but I was shut out from intercourse with them, except through means which I obtained by stealth, when I was unseen and unknown, and which rather increased than satisfied the desire I had of becoming one among my fellows. The gentle words of Agatha and the animated smiles of the charming Arabian were not for me. The mild exhortations of the old man and the lively conversation of the loved Felix were not for me. Miserable, unhappy wretch! (13.19)
It doesn't take long for the monster to go from ugly-and-kind to ugly-and-murderous, and the whole transformation takes place because he's ugly. So what's the difference between being innately ugly and only surface ugly? Just a few bad interactions?
"It was about seven in the morning, and I longed to obtain food and shelter; at length I perceived a small hut, on a rising ground, which had doubtless been built for the convenience of some shepherd. This was a new sight to me, and I examined the structure with great curiosity. Finding the door open, I entered. An old man sat in it, near a fire, over which he was preparing his breakfast. He turned on hearing a noise, and perceiving me, shrieked loudly, and quitting the hut, ran across the fields with a speed of which his debilitated form hardly appeared capable. His appearance, different from any I had ever before seen, and his flight somewhat surprised me. But I was enchanted by the appearance of the hut; here the snow and rain could not penetrate; the ground was dry; and it presented to me then as exquisite and divine a retreat as Pandemonium appeared to the demons of hell after their sufferings in the lake of fire. I greedily devoured the remnants of the shepherd's breakfast, which consisted of bread, cheese, milk, and wine; the latter, however, I did not like. Then, overcome by fatigue, I lay down among some straw and fell asleep.
It was noon when I awoke, and allured by the warmth of the sun, which shone brightly on the white ground, I determined to recommence my travels; and, depositing the remains of the peasant's breakfast in a wallet I found, I proceeded across the fields for several hours, until at sunset I arrived at a village. How miraculous did this appear! The huts, the neater cottages, and stately houses engaged my admiration by turns. The vegetables in the gardens, the milk and cheese that I saw placed at the windows of some of the cottages, allured my appetite. One of the best of these I entered, but I had hardly placed my foot within the door before the children shrieked, and one of the women fainted. The whole village was roused; some fled, some attacked me, until, grievously bruised by stones and many other kinds of missile weapons, I escaped to the open country and fearfully took refuge in a low hovel, quite bare, and making a wretched appearance after the palaces I had beheld in the village. This hovel however, joined a cottage of a neat and pleasant appearance, but after my late dearly bought experience, I dared not enter it. My place of refuge was constructed of wood, but so low that I could with difficulty sit upright in it. No wood, however, was placed on the earth, which formed the floor, but it was dry; and although the wind entered it by innumerable chinks, I found it an agreeable asylum from the snow and rain." (11.9-10)
People reject the monster, although good-natured and kind, simply because he is scary looking.
"I endeavored to crush these fears and to fortify myself for the trial which in a few months I resolved to undergo; and sometimes I allowed my thoughts, unchecked by reason, to ramble in the fields of Paradise, and dared to fancy amiable and lovely creatures sympathizing with my feelings and cheering my gloom; their angelic countenances breathed smiles of consolation. But it was all a dream; no Eve soothed my sorrows nor shared my thoughts; I was alone. I remembered Adam's supplication to his Creator. But where was mine? He had abandoned me, and in the bitterness of my heart I cursed him." (15.11)
You'd think that the monster would know something about not judging by appearances, but you'd be wrong. He wants his companions to be "amiable"—but first of all, he wants them to be "lovely."