You're being treated like a villain because you have come on here complaining about one of the few moves the current government have done to make things a bit more equal in this country.
You wouldn't have received tax relief on money borrowed to make investments and so you shouldn't on your BTL properties. Its been an anomaly in the system which has allowed far too many people to become landlords who shouldn't really have been so. The BOE has been calling for this sort of clamp down and it is about to get worse as you will be expected to have higher deposits in future. BTL landlords are often vulnerable to this sort of change.
Also, why should the state subsidise your wealth accumulation and to pass it on to your children? This is effectively what that tax break is. Your comment about "paying so much tax" has got to be rubbish because you also say that you "just" earn enough not to get tax credits seem rather at logger heads with each other. Oh and I doubt you will do enough to avoid CTG on your properties, quick moves in years close to each other are investigated.
You sound exactly like a lot of poster on here, don't want to pay any tax, but love the fact that society works well so you can make "70k in the last year".
Finally you're being treated like a villain because you have been rather stealth boasty and very smug about your "wealth".
To stop you arguing your jealousy bit, I'm a Landlord too, but I own, a 3 bed flat in a Maida Vale mansion block which I bought in the early 80s, as well as my lovely Q.P des res. I pay C.T tax on my earnings from the flat and have done for years ( despite the fact that we rent it below market rate), I probably won't pay CTG on the flat because once the last DC is done with uni (another 6 years) we are selling our house and moving into the flat, and spending our money. However it is likely that the DC will have to pay inheritance tax on that. I'm not jealous, I could buy you lock stock and barrel.