This is the kind of thing that bothers me most about politics. Lies, misleading information, and ignorance. Unfortunately, while the left is not immune to this kind of nonsense, it seems the most egregious offenders are on the far right. This is unfortunate because it demeans true conservatism and is insulting to common sense.
The fact is what was voted on and quickly reversed was a reduction in future pension COLAs which is in no way a cut in pensions. Calling this a cut is like saying your pay was cut because your raise was 2.5% rather than 3%.
In addition, as many Republicans as Democrats voted for the change.
Of course, while this is far right nonsense, the same logic and misinformation was used by the left when a similar change was proposed for the Social Security COLA which was also called a cut in benefits.