My daughter was an elite swimmer. When she first felt her first sting of trash talk in the pool - this from her own team mates mind you - she was upset.
My advice- keep your gob shut and let your swimming do the talking and that will take care of it. And it did.
I agree. Let the issues be settled away from the event. This trash talking (true or not) can't lead anywhere good.
My grandkids swim also and I find it obnoxious when young girls write “Eat my bubbles” on their backs.