If one remembers, in both instances where baptism of the spirit and tongues were mentioned. SOmething major had happened.
in the first instance, The group of people in the room were given power. And this powerful event helped to give them boldness to carry on, where as before, they did not know what would happen. And probably scared.
in the second event, peter, Who had a history of failure to believe God would save gentiles. Was given. A sign he could not refute. As he said, If God gave the GIFT of the HS to gentiles to. Who was he to argue. If these gentiles did not show these gifts. Chances are peter would have never believed they were saved. He would not mention about any argument, unless he was bound to make one to begin with.
Again, Not Saying God does or can not use tongues today, He can do whatever he wants. The issue is, What purpose would he use them for. That is where the disagreement comes I think.