I was in year 7 in maths, about half way through the year the teacher decided to change the seating plan and moved a horrible person next to me. At first, he started just making random comments about how smart I was and I thought it was quite funny and laughed at it quite a bit, but he eventually got crueller and stopped me from doing my work sometimes. I ended up dreading going to maths and wished I would just skip the lesson, but I never would. Near the end of the year we changed into a different classroom so I wasn't sat next to him, I was so glad.
I bumped into him a few times in year 11 and he seemed to be extra kind to me, but didn't really say much. I think he felt bad about what he did. I have no idea. Perhaps he just forgot who I was. But he wasn't so nice to other people he didn't know. I suppose I'll never know, hah.
Other than that, I've had a few comments years ago about how shy I am, but nothing really.