When you have deep attraction and love for Krishna, who cares what others think or say, just like when dogs bark at your car, one just keeps driving undisturbed.
There will always be envious fault finders out there who will always be odious and offensive by barking their foul mouth at your sincere endeavors of telling others about Krishna.
Therefore, just like one ignores a barking dog, just ignore the envious.
The fact is, the great movement of selfless Sankirtan (preaching) is never stopped or disturbed by the envious pretenders, including many in devotional dress pretending.
No cults like ISKCON or splintered Gaudiya Math groups have absolute ownership, control or demands over Lord Caitanya's great Sankirtan Movement no more than the Catholic Church has absolute control over Christianity.
You do not have to be a member of any cult to be a devotee of Lord Krishna.
Just like Prabhupada rejected his Godbrothers and the Gaudiya Math and established his own Movement, today some devotees, sannyasis and Gurus are doing the something beyond the influence and reach of ISKCON or the Gaudiya Math to preach the message of Lord Caitanya Mahaprabhu.
So have faith that the REAL preaching of Lord Caitanya Mahaprabhu's Sankirtan Movement will ALWAYS go on and on by genuine selfless caring devotees and will always grow, as we are all seeing all around the world in the homes of so many people.