Compose a literate and well-argued letter for publication in your local newspaper, detailing the abuse to which you've been subjected and pointing out the legal position, which is that cyclists have the right to use any road on which cycling has not been prohibited (mainly motorways, but also a few dual carriageways such as estuarial bridges and a few tunnels - the A50 through Stoke springs to mind as a road I wouldn't dream of using anyway), quote the DfT draft code of conduct for cyclists which says (from memory) "If you intend to cycle quickly (18 mph / 30 kph) you should be on the road". If you feel like it, quote the Highway Code Rule 61 - "Use of these facilities is not compulsory".
You might want to pre-empt some of the responses by pointing out that roads are paid for from general taxation (motorways and trunk roads from the Consolidated Fund which is where most taxation such as income tax, VAT and, er, VED aka "Road Tax" or even "Road Fund Licence", still referred to in current car adverts, ends up; other roads are paid for from the highest tier of local government, i.e. Council Tax + grants from the consolidated fund).
You might also want to submit your letter on this forum for peer discussion before sending it to your local paper.
The end product will probably filter out online feedback from the relatively thoughtful motorists, leaving a frightening set of responses from the knuckle-draggers, who will be mercilessly destroyed by the superior intellect of contributors to this forum.
Alternatively, ignore this post. I'm currently outside of 3 bottles of rather good lagers on offer from Waitrose, and most of a bottle of Pinotage from Lidl. How's that for a demographic?