She didn't have to egg him on to be angry. As soon as she compared him to a dog his agitation level surged, and he straightened slightly. "Miss. I'm not some... some animal," he said tersely. "Kindly don't refer to me as such." She was bullying him, calling him names and keying in on his insecurities. He'd felt the brunt of such bullying all his life and could identify it easily, even if he still struggled to answer it with a calm and rational mind.
Her rant about his size and his shame seemed to do the trick, however. By the time she demanded that he get angry his ears and the back of his neck were bright red. He folded his free arm over his chest, a defensive gesture, though he leaned forward slightly and shook his head. "Perhaps it's not my own shame, but others' fixation. You call me a freak and rant on about my size, what about you? A little.... little mouse! Perhaps it wasn't me being so big that got you stepped on, but you being so small. Have you ever thought of that? Or, perhaps, you might pause to consider that I'm more than a big sized shoe. So maybe it's not what I have to pay attention to." He stopped himself then, closing his eyes and inhaling before he snorted.
"I don't have time for these insults. I apologized, and I don't deserve this. If you're so obsessed by size go invest in a pair of high heels and leave me alone." He might not be able to dodge her, but a benefit of his height meant he could stare up and above her, jaw clenched and face still burning.