I had to do some googling to understand what is going on here.
McGregor started the CJ Watson references in
January 2017.
His reasons for that are a tad
obscene, but that's his problem.
In any case, CJ Watson wore 23 in the Warriors, and guess who else wears that jersey in that team... right. So, he messaged McGregor on instagram asking him to remove his jersey. The rest is in the pic below.