You have to ignore online comments. Unfortunately, a large percentage of society is only thinking of themselves and screw everyone else. They may be frustrated cause they have a lousy commute and nothing is being done to improve the roads so they resent any money being spent anywhere else. They don't stop to think how bike lanes help the flow of traffic and how they might get some cars off the road or that bicyclists pay taxes just like they do and deserve to have some infrastructure just like they do.
Some of the people are total d-heads and others are just people that are venting without thinking how rude they are being. Not worth giving them a second thought.