It doesn’t have to be creepy or problematic, but your son would have to know what worrying things to look out for. Nothing wrong with having a chat saying “hey just because large age gap friendships are rarer, i wanted to make sure you’re on your guard…but your friend might be awesome, just have your eyes open”.
What specifically worries you?
Reminder and PSA: it’s never been about race, or about American versus Canadian, or about poor vs middle class - it’s always ever been the Uber rich governing class vs the 99%