Is it normal to feel you cannot trust a person if they hang out with those who have been rude to u?

I mean, they associate with these girls who were somewhat relationally aggressive to me; rolling their eyes when I pleasantly say hello, laughing at me blatantly, making little snide comments about me being ''the retiring type'', shushing me when I speak in their clique, being dismissive of my thoughts and overriding them with their own from a big ego and this type of thing. This particular person associates with them and adds their articles to this magazine of which he is the editor. It is a side project to his main career and the magazine is free of charge. So, I mean, I feel a bit like I can't trust him and a little betrayed. I think maybe they are nice to him but he knows they have not been so to me and I was perfectly nice to them and to reward them regardless says something maybe of his character. I feel like he thinks I am hyper sensitive but relational aggression is relational aggression. I call it like I see it and it is a kind of covert, insidious abuse. What are your opinions?