I've also been attending rather raucous, evangelical, Spirit-filled, hand-raisin', tongues-speakin' churches for years..........and have played rather loud, heavy guitar in Praise and Worship teams for a very long time.
With that said.........these two are out of line. I'd have to know exactly what they're doing to pass a personal judgment here, but let's just say that a Christian does NOT become a nuisance to those around them deliberately, that a Christian should share his or her faith, NOT shove it down unwitting listeners' throats, and a Christian best demonstrates their faith through the way in which he or she lives his or her life, not by how loudly one can "pray" or otherwise worship the Lord.
And let the apartment dwellers say "Amen"!
But not too loudly, OK?
a.cricket