my T was the clinical director of the treatment program i was in. he was super busy all the time hence he was late a lot. i pretty much just told him that i thought it was disrespectful. it kept happening though, so i realized it was his job making him late and not him lollygagging around. after we both left that place he has been so much better abt punctuality.
i would just express how it makes you feel and maybe even the part about how you take it personally. i think that is natural to feel that way.