I totally feel you and have had similar experiences on the web.  It seems like some people think that those with differing opinions are either wrong OR in this case it's like they think your opinion doesn't count.

Many people here seem to agree to disagree, I know many people rated movies highly that I hated, and vice versa, and generally we get comments like "well I didn't like it but glad you did!" or whatever.... However there will always be a few who think any opinion besides their own is wrong. There are also some sensitive people on the web who think anyone who disagrees is being insulting to them.