Sabbath keepers by law are also carnally-minded proselytizers, who pose fellowship or preach Jesus with the sole purpose of recruiting to their Sabbath, and they must ostracize them that remain unconvinced and obey not the Sabbath law.
It is necessary for them to do so, even as Paul commands us to not keep company with them that call themselves Christian and yet are open fornicators. So it would have to be with those who openly defy the Sabbath, if indeed the Sabbath were law of God, just as Nehemiah did by brute force to enforce the Sabbath by the law of Moses. Which was a good work then, but a pernicious and carnal work now.
They will wait a while with the new believer, of course, so as not to run them off, which is an old carnal business trick of the world, but sooner or later they must lay down the real law of their faith: the Saturday-only Sabbath keeping, and if the target does not submit to their rule, then they of course are cast aside as unworthy.
In their recruitment model they 'profusely love' the new recruit only long enough to convince of Sabbath keeping. All such churches do likewise that command carnal ordinances that separate them as really special. Islamists do the same. In the end, they only pose love of neighbor in order to get them into their faith of Sabbath.
It's called soul-getting, not soul winning. They are go-getters for the Sabbath. It's all the work of a carnal mind that commands obedience to a carnal commandment, that no longer is commanded by God, but only by men. They give lip service to the name of Jesus only to recruit in the name of Sabbath:
"This people draweth nigh unto me with their mouth, and honoureth me with their lips; but their heart is far from me. But in vain they do worship me, teaching for doctrines the commandments of men." (Matthew 15)