The gym I go to is a relatively cheap 24 hour one, although not one of the big, well known companies. They repeatedly cancel classes at short notice and you can only book a class a few days before. On three occasions I have been unable to attend a class last minute and have received a snotty email from them about this.
Don't get me wrong, I'm fully aware most gyms employ this tactic to guilt you in to cancelling your space ahead of time and prevent you from taking a space someone else might have wanted. I think it's 100% fair to send an email if the class was fully booked with a waiting list and you've not turned up.
However, this gym shows how many spaces are available on the class until the class begins. I think that if a class still has say 4 or more spaces (for example) that people could have signed up to, then a snotty email isn't really appropriate as I haven't actually taken a space away from someone else? Equally, there is no polite cancellation email apologising when they cancel classes (quite regularly) however they're quick to send the email when you don't attend.
AIBU to get irritated when I receive an email threatening to "black list" me from classes when in fact this gym repeatedly cancels on me and the class had space for more people to book anyway?