All these pointless arguments wouldn't have happened if you didn't use the word "entitled" in your OP. You just needed to have said that if someone wants to request something, they should ask politely. That would have brought your point across without all these "entitlement" arguments.

Which is true for any case. If you want something, no matter whether you are tank, healer or dps, just ask politely.

It is in the nature of tanking that tanks get the final say in deciding the pace of the party. There is no entitlement in that but just what that role entails. If a healer or a dps wants to request to go faster or slower, there is also no entitlement in that. That's just personal preference. What matters is how you go about asking it. And I will say that most people seem to be lacking manners on the internet nowadays.