Why does he say that about me even though I'm good?

When I was playing Fortnite with a couple of friends the other day, a friend was watching me and saying, "He's got an aimot again," even though I'm actually a good player. What do you all mean? Do you say that? Or was that wrong with him?

If you don't use one, ignore such statements, done!

I don't know how old you are, but with friends it's completely normal if it annoys you then just say it once and if he doesn't stop saying it ignore him. The same applies to strangers.

Probably envy

Without having listened directly, you can't say exactly what was actually meant. Possible options:

A compliment
It should be a joke
It is meant completely seriously, it often comes from worse players

So it doesn't make sense to speculate a lot here. All three variants are quite common.

There's nothing wrong with that, my friends often say that to me for fun when I meet a little more than usual, so just ignore it if it bothers you.