When I was in school, I had to catch the school bus every day at 6:20 AM and have never been late.
It's not because I was super invested in going to school but because my mom had instilled in me the value of being on time. I feared about being late because my mom made it seem that being late was the worst possible sin you could commit so I was there at the bus stop—dutifully five to ten minutes early each morning.
My mom and I used to watch other children come rushing in with unkept uniforms or with their breakfast still unfinished and it seemed like a wild concept to my child self to be that unkept in public.
And here I am in college in sweatpants 24/7.
All jokes aside, my point is that being late is unacceptable. While that sounds harsh, it's the truth and something that should be said more often. I don't care if you're attending a party, a call, or a meeting - your punctuality says a lot about you.
Moreover, I don't know if this is a common thing, but being late just gives me stress. Maybe it's my mom's strictness on the subject or just something that I have learned along the way, but reaching to a place on time (and not five to ten minutes early) gives me a sense of doom. It feels like I have not only disappointed the person who I am meeting but also myself (and of course, my mom and everyone whose opinion I value).
I wouldn't say that I get the same degree of anxiousness when I am late with friends because that is a more casual setting and being late isn't a huge deal unless we are meeting for something that requires the time crunch like a movie screening.
Maybe it's just me who really changes my opinion of a person if they are late.
Recently my supervisor told me that he always notices that I am pretty much constantly five minutes early and that reaffirmed my work ethic so maybe it's not just me.
There's a reason we set meeting times and deadlines. It allows for a coordination of efforts, minimizes time/effort waste, and helps set expectations.