unofficially calling oneself a count.. Many people nowadays have no opinion about the gentry or are negatively disposed to them.
Unofficially is the key here. In England, Scotland, Spain, Holland, Scandinavia etc the courts rule on succession to titles and arbitrate in disputes. In Poland it's all unofficial for the reason (the constitution) that you mentioned.
As for being negatively disposed, it's worth reminding that there's the tradition that all the gentry (szlachty) were considered equal in theory. One reason why Joseph Conrad declined a knighthood which he was offered coincidentally during the period of great optimism when Poland regained independence.
Another negative point, I once heard a lady say, who lives as it happens in the same building as myself and a Count (one of the better known Polish aristocratic surnames but who doesn't use his title) some amusing things about the poor taste of certain people who' we build modern houses in our neighbourhood with porticos and pillars to underline their noble origins.