The retail version of the spec tree atm is fantastic you can swap anywhere and there is no social pressure to play what you don’t want to play.
If you are associating with players that bully you I suggest you find others to play with.
Majority of the player base will accept the role you are and will do nothing more than maybe ask you to swap for a particular fight and a simple no I really don’t want to will suffice.
I also encourage to have a go at other specs it can be fun and rewarding but if you really don’t want to then don’t. Only bullies and undesirable people to play with won’t accept your decision.
there are so so many players out there that will be happy that your happy playing the role you signed up for.