You need to at least learn how to do big pulls and be comfortable with it, you don't have to enjoy every single second of it. If you have a party that wants to do big pulls and is capable of it, it's not really your place to hold the party hostage just because you don't feel like it. Don't be selfish. Though I don't really pug often (and I definitely don't pug as a tank, no thanks), so I guess protocol would be to ask at the beginning.