Bihaan was bashed a lott during his dance with sankar.. I can add one more reason, bihaan was alwez portrayed as someone who is very impulsive and moti-buddhi so such kind of step was expected from a moti-buddhi.. And he didn't do that for any REVENGE.. He used it as a last step when after so many attempts she didn't back off from the marriage..
Also, I guess u came back to the forum after so many months (I was a silent reader by then😛) so, let me just fill in.. 90% of the forum were supporting thapki for her comeback as a strong woman.. It reduced to 80% when they got to know that her main target is bihaan... Then further reduced to 70% when she excluded PZ from her revenge list.. Then it drastically went down to 50% or maybe 40% when they got to know she is seeking help from DJ.. Jo bhi baccha kucha tha bride-swap drama ne aur gira diya.. N now kabirs drama.. Don't worry, tables will turn soon n people will support her..