I wouldn’t laugh at them, but I’d tell them they’re wrong. The book has been closed on this since Sid peaked.
A lot of this comes down to what specific questions we're talking about.
Who are the better overall hockey players?
1. Lemieux
2/3 Crosby/Jagr (I have Crosby ahead, but it's somewhat close)
Who has the bigger legacy in Pittsburgh (taking everything into account, career, reputation, intangibles, community, fan support, etc)
1. Lemieux
2. Crosby
3. Jagr
Who are the better hockey players for their time in Pittsburgh only?
1. Lemieux
2. Crosby
3. Jagr (Crosby has his full career here, Jagr only partial)
Lemieux is defintiely the better player overall by a longshot. But being the best player doesn't always translate to being a greater Penguin/legacy. I still have him #1 (him being an owner, saving franchise etc is huge) - but making an argument for Crosby is probably plausible.