It's just a opinion of some guys. They don't like to use bimetal jackets in highend and/or precision rifles. It won't really damage your rifling but a recent study shows that it causes accelerated barrel wear.
If your happy with it go and shoot it! It's not gonna break your gun or wear out the rifling in 100 rounds or anything. I just wouldn't shoot a ton of it out of your precision rifle; I would find another round that doesn't have a bimetal jacket for bulk volume shooting. If your just a occasional shooter don't worry about it.