I'm still a bit unclear. Are we talking about an interstate highway where, like all the rest, pedestrians, bicycles, farm eqpt and such are not allowed? If so, then the OP was not incorrect in pointing out this bicyclist and calling him a fool. Or something like that.

If this is some stretch of interstate highway where bicycles are allowed (?), then the OP is wrong for criticising the bicyclist.

The OP also criticised the bicyclist's choice of clothing. He probably meant no harm, but it's a silly waste of everyone's time. We've all pondered what clothing works best for us, experimented with some and made our choices. We're grownups and we don't have to answer to each other for this.