You see refs do it too!
Here's the thing...
This isn't something you can regulate for everyone! Just take 30 seconds out of your season & explain that this is what you can expect, a hand shake or a "dap"!
If you have a preference then tell your wrestler what to do but if the other coach just wants to dap then what can you do!
Sometimes I'm just glad to get a sign of respect from some people, even if it is just a dap!