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Has Harrison ever directly said that he hates Han Solo?
I don't recall exactly (and I am a fangirl of Harrison's), but from various comments that have slipped out over the years, it would seem that yes, he DOES hate Han Solo. For example, he stated he was unhappy with the ending of RotJ, saying that it would have been better had Han died because, "He has no mama, no papa, no family. But George wanted a happy ending." (That is about all I can remember of the most revealing of the quotes.)
Of course, Carrie Fisher was a little more vocal about it at one point, namely because Star Wars made her, Harrison and Mark Hamill overnight sensations, and the attentions of wildly enthusiastic fans was quite unnerving. She even stated that one young man wrote asking for her autograph, threatening to kill himself if he did not get it. She sent an autographed picture of herself as Leia, and advised this fan to seek psychiatric help. Carrie, the daughter of Debbie Reynolds and Eddie Fisher (and stepdaughter of Elizabeth Taylor at one point) may have been better braced for stardom, because she saw how her famous parents dealt with it. Harrison Ford, on the other hand, is notoriously closed mouthed about his life, and it sounds like overnight success like this really upset him. In addition, he was already married with two kids, and he may have worried over their safety.