I don't think this was intended to bully you.
Your post did not state they had to be serious replies, I got (and based on the likes - others) a laugh out of the fun poked at the 3D models odd gravity. I didn't see it as an attack on how you set up the models, simply that 3D models can do weird things this way (I've had a good laugh while trying to set up my own poses time to time)
Anyways, this is a comic/writing forum. You said people can add dialog. These forums are home to many different artists who write many different genres - for example comedy.
I thought your OP was cool cause yeah, everyone can see these panel set ups and do many different takes on them. There was nothing in the OP that said it had to follow strict rules.
Had the thread gone on longer and consisted only of panty jokes if you expressed you wanted it to be more serious - that would be considered bullying. But after the first joke was made all you said was:
which reads as lighthearted and enjoying the fun imo?
The comic with the first joke did install some community spirit from what I've seen, it just might not be in the way you desired as Fifthpaw pointed on in a previous reply.