I don’t know if it will lead to aggression, but I personally don’t like using playback. It takes the fun and spontaneity out of the whole endeavor, and I’m sure it has at least some effect on the animals and as I get older I care less about doing what ever I can to see a specific species and more about just enjoying being in an area and seeing whatever’s available.
For what it’s worth, last year some friends and I hired a local birding guide in Panama and thankfully he wasn’t into using playback much. He told us that in an area famous for a certain bird, too many people and guides have used playback and the birds basically don’t respond any longer.
If you search “birding ethics playback” you’ll get a lot of articles discussing the issue as well.