I don't generally enjoy it when people are late without telling me in advance because it leaves me in this weird limbo of not being able to commit to anything
(like, even if someone's an hour late, I don't Know that until an hour has passed if they don't tell me "I'm going to be an hour late," so I can't commit to anything that takes an hour. I can only fritter with short-term things for an hour cumulatively—because for all I know, if someone's 20 minutes late, they'll show up at minute 25, so I don't want to start watching a show only to stop it right after opening credits!)
But I especially don't like it when the person who's late is the one who decided the time
Like, my guy... learn your own schedule, do you understand how much of an asshole you look like if you pick times to meet AND are chronically late