No disagreement with your general point, but there's hate language going in both directions. It's instructional to look at the comment sections of the Daily Mail and Telegraph; and despite many headlines about wicked "Cybernats" the only quantitative study I've seen found that online supporters of independence were much more likely to be on the receiving end of abuse than handing it out. (That may be from Labour people as much as people on the right, of course.)

I think from a left-wing point of view, the vehemence is often driven by the perception that right wing policies negatively affect the vulnerable - the poor, the unemployed, the disabled - and that amounts to unfair victimisation by the powerful. Those who accept that people on the right are well-meaning have a similar condescending attitude to the one you describe above - "they're Tories, but they just don't get it, they've never been in that situation and don't understand the harm they're doing." Those with a lower tolerance threshold go for abuse.

I'm genuinely not sure what would drive a similar vehemence from the right? (I'm excluding the scary xenophobic right from this - we're talking about basically reasonable people here who cross a bit of a line into using abusive language, right?)

Sorry if I don't respond too much - busy with other things, but interesting topic.