The issue isn't that much about the sent stuff, which is very questionable particularly considering his position as manager, but it's the fact that he hurt and lied to people, which together with what he sent and his position made things very bad for him.
The actual messages aren't the problem. The problem is when someone hurts and lies to people. There are people like this in the community too tho. Two of the most notable examples I know either have been blacklisted or left the community unpunished.
Hurting and lying to people while being in a position of power is definitely very bad tho.