Being overseas I am just happy to meet a Christian of any stripe and would be glad to worship with them.
In the USA, by contrast, I've met folks trying to plant "Truly Reformed" churches in major cities in the US, sometimes claiming "there is no true gospel witness in this city" - (a blatant lie).
The BEST homework I was given during missionary training was to find a church in my area which troubled me. This church would not be apostate or heretical but would contain very different doctrine and worship styles. My assignment was to attend this "Different Church" for 3 months and to simply love the people and refrain from sitting in judgment of them. This was excellent practice for moving overseas.
I ended up going to a Full Gospel Church and even preaching for them (on the sufficiency of the Word of God, done in a non-confrontational way that was not polemical and in a way that they could yell "amen" to my message....and boy, did they ever yell AMEN a lot in that church...and got up and jumped up and down). Besides some of the tastiest food I ever ate, I do believe there were many true Christians in that church despite their gymnastics in the pew and their near-aerobic workouts during the singing. And they never minded that I just stood there to sing instead of swaying about.
I believe many of the Reformed equate holiness with strictness of doctrine and rigidity instead of love to God and the brethren. This creates a strictness and tendency to judge in the name of discernment. But the Apostle Paul in Romans 14 seems to tell us that love towards the brethren is more important than minor theological matters such as days, etc.
If we believe we are the stronger brother, then we can bear with the weaker brother by loving his church despite its faults (and without always pushing...pushing...pushing...a hidden agenda to "reform it" through constant complaint or protest). All who love the Lord Jesus are saved, despite some major shortcomings in doctrine. Therefore, we ought to love them.
The time is coming when our grandchildren will be glad to be "mere Christians" defending one another against persecution and prosecution in the West for not worshipping the Beast. They will not care about EP or non-EP; they will merely be glad to have a friendly ally in the fight as our foes hound us and take away, first, our social media rights and free speech, then our jobs, then our homes and our children for not indocrinating them in the State Religion, and, finally, our lives. In that day we will be glad for merely knowing others who love Christ.