How do I tell a player they're not welcome back?

[AMFV]

Tell him he doesn't have to come if he doesn't truly want to. If he doesn't take the hint then tell him to not come.

This is probably a bad idea, no offense, but people are really really really bad at taking hints, particularly ones like this, which are basically telling him that he could come, if he wants to come enough. Of course, the player believes that he wants to play enough, or doesn't think lateness is that serious a problem. In all seriousness some groups are completely fine with people missing sessions or being late.