Would I be the asshole if I asked my brother in law not to kiss me?

I have 2 siblings and my husband has one sister. All are married and when we meet we hug hello and we hug goodbye. Gender doesn’t matter and I know it is a normal for many people. We hug siblings-in-law, parents-in-law, nieces , nephews etc. we also hug close friends and their partners. I have never kissed anyone(other than my own siblings) however and I haven’t been kissed either.

But my husband’s sister’s husband has started kissing me while hugging. It started after his mother died in covid. I don’t know if it is related. It is a quick cheek kiss (with time even neck or ear). I don’t know. I feel it is weird but I have tried to see how others react to it but neither my husband nor his sister seems to think it is weird or even notice when I try to have eye contact with them.

Now my question is, can I ask him to stop or would it be rude? What makes me think I am being a brat is that we meet my sister in law and her husband maybe 4-5 times a year so it is not a big deal and if he doesn’t mean ill I would only hurt him and make him uncomfortable.