For me, the pairs with highest spreads are my least favorite cause it’s hard for me to cross over the spreads point to make a profit and I have to wait for a long time if they do go over that. I like the popular ones due to comfortable spreads and high volume on trades. I don’t like any two European pairs with each other as they are not having much movement due to the fact that they re kind of similar in nature and therefore less movement.
Why some FX pairs should be disliked? :) I would say better to monitor few pairs and to select for trend trading and for choppy trading. For example pairs like GBP/NZD, USD/TRY and etc. are trending - then apply systems for trading in trend. Other like EUR/CHF tend to range more often and then range trading strategies would be applicable with higher rate of success :)
Hate is an emotion. There is no space for emotion in forex trading. Even the volatile pairs can bring you profit. Even the exotic high spread pairs can bring you profit. It all depends on your approach.