” But try putting on tefillin in Shaarei Chessed today and you may be shown the back door if you’re lucky. “
I know a rabbi who took his tefillin to a Sefardic synagogue in New York on Chol HaMoed and was firmly asked to leave.
I know another rabbi who took his tefillin to a shul in Jerusalem on Chol HaMoed; he said that the congregation acted like they wanted to kill him.