My boyfriend's friend doesn't respect his time.

Hmm... it obviously depends on the individual situation. I have friends with "quirks" I tolerate because I love them and they are great friends outside of that.

It could be a sign that he is willing to make excuses for or tolerate bad or selfish behaviour that inconveniences others when his friends are the ones doing it. If that's a problem would depend on how far that goes for me. Lateness may be something comparably harmless your boyfriend can live with but I would try to (gently) find our what other behaviour he would tolerate or make excuses for from his friends without saying anything (e.g. open misogyny, mistreating women...).

I have to say I’m always often late. 10-20 mins late when I go out with my gfs and even my male friends. It’s not because I’m disrespectful of their time but i’m so busy between work, my son, and 1000 other errands/things to get done so I have so much to do. Plus sometimes I get stuck at work in meetings longer than expected which I can’t control. My friends know me and love me for who I am. My male friends always happily wait for me because they know I’m getting ready and also don’t like to leave the house not dressed well/looking good. I would say that’s probably the worst about me 😅

I think it's hard to say from this amount of context. If your bf's friend has a pattern of disrespecting your bf and never prioritizing the friendship, then it might be a problem and your bf probably lacks boundaries if he puts up with it without saying anything, but that can be worked on.

From what you described, I don't think the friend's attitude reflects on your bf in a bad way. On the contrary it shows that your bf has principles and respects people's time so he's annoyed at his friend's behavior.

It would reflect badly on your bf if, for example, instead of being perpetually late, the friend was racist/sexist/misogynistic or disrespectful towards you and your bf enabled him or made excuses or blamed you for feeling uncomfortable (it's a hint that he at least somewhat shares his friend's mindset).

From what you describe though it just seems like an annoying little quirk. Have you guys tried lying to him about the time of your meetings? If you want everyone to be there at 8:00 tell him the gathering starts at 7:00 and boom, he shows up "early" at 7:45. Although this could backfire if the friend realizes that no one is ever here "on time" (from his point of view) as he could think it's okay to be even more late. I guess your boyfriend has to decide whether it's worth reconsidering the friendship entirely.

Is it a pretty large group that comes to these games?