I'm a slow eater too, but some people take issue with it.
When I was 4-5 years old, one of my grandmas dislike me for eating slowly. One day, I took my time eating and she came up to me and insulted me. She called me slow and stupid. On the other hand, she praised my brother for eating faster than me. The weird thing is that the next time, I ate faster than my brother and I told her about it. But instead of praising me, she told me to go away. She kept on looking at my brother and praising him.
When I lived in the dorm, there were also certain people who don't like the way I eat. One time, I sit in the cafeteria eating slowly, and there were 2 snobby looking guys who looked at me and commented on how slowly I eat. When I was done eating and as I walked towards the trash can, the guys stared at me and one of them yelled, "Are you done yet?" and they both laughed. It was disgusting.
I also experienced the same thing when I was at a restaurant. One of the waitresses didn't like me for some reason, and she kept on talking about me, including how slowly I eat. I heard her say nastily behind my back, "eating so slowly..." When my family and I finished eating and walked towards the door, she yelled, "Go away..." I never went to that restaurant ever again.