If this is Shittah Gra why don’t they say it in Chaim Berlin? We have a procedure for a late comers to say Barchu and that is to clop first. I think this tells they olam something unusual is about to happen. The Sefardi barchu as made as if it is part of davening.
The clop gives me a heads up a barchu is coming. When these extra barchus are said I an not prepared for them and will not answer since I can’t respond immediately.
This minhag should not have creeped into Ascanaz minyonim in Erez Yisroel since it isn’t our minhag. But, since it is there I assume I has to be answered to. There are those who are trying to foist the Sefardi Minhag on Askanaz shuls. They have total disregard for out minhagim. Those who say it have no respect for halacha since the halacha says minhag is in a makom. I don’t think these people can be trusted for other halacha issues if they can violate this.
We do have a minhag for a late comer to say barchu and this young man had a right to that minhag. If that was the case he should have told the gabbai when he finished davening.
There is another issue the sefardim are insisting on in our shuls. When they say kadish yasim they say their version. Which is very wrong. Again they do not respect minhag hamokom.