Basically yes, Poland has a very longstanding liberal tradition
I'm not sure if you're sacrastic.
This is not entirely correct. Poland prided itself for being a free and liberal state, but democracy was only for the gentry (szlachta). Szlachta was about 20% of the population, and this statistic probably includes women. The vast majority of the rest were peasants working on socage terms. That was slavery in all but name. Russia also likes to pride itself for never having sea colonies, but their policy on conquered lands was extremely similar.
Also before the outbreak of WW2, Poland only had 69% Poles, the rest were other ethnicities. The times when Poland saw the most liberty were simply the times when central government was the weakest. Polish state was always very keen to polinize other nations living within its border, with discrimination or violence. Those who praise Polish-Lithuanian Commonwealth hardly ever bring up it broke because Poles were oppressing other nations (like only having Polish officials, only Polish schools, etc).