No. Tastes are subjective; beauty is objective. This is what permits us to say whether someone has good or bad taste. If it were purely subjective, then it would be impossible to make these claims. They would be nothing more than expressions of power, whether by the majority or some authority.

Fads and fashions occur, sure, but they aren't always aligned with good taste. And you can have varieties of beauty (why can't two different styles both be beautiful in two different ways?). I also wouldn't exaggerate the divergence. Some of what you've written is cliche rather than history.

Unity, the true, the good, and the beautiful are but three different perspectives on being and a matter of objective reality. The discernment or subjective condition of the tastes of a person have to do with how one receives reality rather than reality itself. Reality is, after all, received according to the mode of the receiver.

"Beauty is in the eye of the beholder", though I agree some forms of beauty are relatively universal