Why judge frats on other frats they mix with?

Recently I've seen a ton of posts judging Chi Phi for mixing with pikapp or Lambda mixing with Pike. I just don't understand why is a legit way to slander houses lol. Its not like people in Chi Phi/Lambda are trying to hook up with Pikes or PiKapps. Personally I think big ways are more fun than regular mixers and if one has "lower" frats in it, I would go anyway. The alternative (what DX does all the time) would be just to not mix that weekend, which is just stupid in my opinion. I think frats should be judged on the sororities that they mix with and not the frats. Thinking about mixing with other frats all the time is just kinda fruity in my opinion