Not that it probably would matter to many of the Twitter folks, but isn't this "reduction in refunds" the byproduct of changing the withholding tables after the tax law went into effect? IIRC the premise was "put more money into people's paychecks now". Many folks look at their "tax refund/payment due" box and nothing else including the much more relevant number of what the total 2018 taxes payable value and comparing it against 2017 total taxes payable.
That being said, again I don't know if this is relevant to a discussion about SALT no matter whether their taxes went up, down, or stayed the same. One can examine the relative merits of a SALT provision both completely independently (a standalone provision) or in the context of the tax code in its entirety. Either way my opinion would be that SALT has no real moral case to recommend it. Even if your goal is to "tax the rich more" then SALT is a tremendously stupid and counterproductive way of doing so atop it being a grossly unfair distortion of state tax codes.