musser z, calm down a little.
Ponevez Yeshiva does indeed fly the flag every Yom Ha’atzmaut. Whether they fly it “proudly” as you state, or just stamm fly the flag for reasons other than being proud of Medinat Yisrael (the political entity, as opposed to the geographic and/or spiritual location) is open to debate.
Flying the flag, however, is not the same as celebrating Yom Ha’atzmaut as a Yom Tov- by reciting Hallel with Shem u’Malchut, refraining from reciting Tachanun, etc. This is no doubt what the Chazon Ish ZT”L and others objected to.
Not sure where a flaming Mangal fits in. Tzarich iyun.