Many teachers at my school often act unprofessionally. A few teachers do not adhere to the dress code (they wear jeans and t-shirts, tennis shoes, untucked shirts...). I have seen teachers have private conversations during PLCs and PDs. Teachers arrive 5 minutes early to school.
I always dress professionally and show up on time. I also try to avoid sitting next to certain teachers during PDs in order to avoid side conversations while someone else is presenting.