Hrm? I couldn't just say 'I'm never late' because that's not true -- occasionally, I am late for various reasons. So yeah, I'm usually never late.
Boasting about something is bad, but what's worse are people who are offended that someone else doesn't share their ideas.
I don't mention where I live or what I do on this forum or in real life unless prompted simply because it's impossible to mention it without people becoming unnecessarily offended. I can only understand it as a conditioned response to people bragging about their vacations.