I used to "play nice" and call for a deeper look into science fairly, showing first how Evolutionism is not science and mere pseudoscience, and then I will related to how Young Earth Creationists are wrong in their argument, though as to the exact age of the Universe/Earth, nobody knows for sure, even if the YEC's number is correct.
Nevertheless, after much talk with Christians hellbent on YEC position since a couple of years ago when our church pastor led a series on Creation, I believe I should no longer play nice as I used to.
Should someone ask while I'm doing evangelism, how YEC is not compatible with science specifically in the context of evolution, this is the format and prioritization of my response:
First, the YEC folks are usually not very smart folks because they argue foolishly for their position not according to the core truth of the Scripture, making guesses based on their bias or twisted interpretation of the Scripture, conflating their interpretation with what God says. But that's alright, it's not required by God to show one is smart, but it's required by God to be humble. But pride does lead to ignorance and foolish arguments.
Secondly, Evolutionism is merely pseudoscience, not science.