DurangoCB and Dabrowski,
I don't think anyone is trying to be mean about it, but CBs with Firestones and flat-brat-style seats are not the best choices for function and safety -- hence, the reaction. These tires have no edge-grip for cornering (try pushing on that tread edge and you'll likely be on the ground), and the seat becomes terribly uncomfortable for rides lasting more than a few miles. They are choices made simply for looks (and Instagram), but hey, it's your bike to do with what you want. If all you do is put around down at less than highway speeds with no turns, you'll be fine. There are a bunch of similar looking bikes that became popular on Bikeexif, Bike Shed, etc. -- essentially hipster bikes for photos and not for function. We just want you to be safe, so try to take the comments in that spirit. In the end, these are you choices to make your bike to enjoy.
I'm not all that sensitive about the issue, but the way it comes across can be rude and presumptive. I'm constantly trying to encourage my employees to be solutions-oriented, so I'll offer a solution:
It would be great if someone made a sticky post explaining the concerns and dangers of modifying bikes. A post that isn't judgmental and dismissive, but helpful. The snarky remarks people make about modified bikes aren't helpful. They just make people leave the forum. And it's unfair to make assumptions. For example: that a person is a daredevil and should want to squeeze every last 1/8 HP out of their engine, or that everyone wants to carry a passenger.
But a helpful post pointing out the caveats of modifying a bike would be killer. "Consider the fact that your tire clearance and the suspension setup you select should be designed to avoid your tire contacting your seat, seat hoop, or fender(s)."
If I stumbled across that info way back when I first decided to heavily modify a vintage bike, I would have just been appreciative and taken note. But when someone prefaces their advice with, "Project looked great until you put those #$%*ty tires on..." all they do is offend the bike's owner and make their buddies snicker.
Anyway- create a post, lock and sticky it, then when anyone has the urge to voice their concern over some other member’s bike, they can just refer to the sticky post.