cause this time, our side started using their tactics and they didnt like that?
Yep.
It happens all the time.
The current "Republican" plan for allocating electoral votes in California, which the Democrats, liberals, and primitives are against, was their own idea, back in the 1980s, for example.
Democrats, liberals, and primitives ignore, utterly ignore, some of the most basic and fundamental laws of nature; (a) for every action, there is a similarly-strong re-action; (b) all is a two-edged sword, with a blade that cuts both ways; and (c) the most delightul law of all, the law of unanticipated consequences.