Paul warned against it. "Don't think yourself higher than you ought". Paul talked about spiritual conceit and self-aggrandizing. He countered his right to boast in his own achievements and suffering as garbage (dung in some translations). All he had done, was doing, or would do, wasn't worth anything compared to Christ Who attained all and did all to make it all possible.
God placed bunches and bunches of scripture in His Word to warn us of getting all puffed up. If you want to see some of them, just go to your concordance and look up "pride". Or, you could do a "Google" search and find over 7 million references to "pride in the Bible". That ought to take a person a bit of time to get over being pompous if they read them all, huh?
Being a spiritual snob is kinda like what my mama used to say. "You're full of yourself." And if we are "full of" ourselves, the Spirit has a little less than wiggle room to operate, to prompt, teach, and guide us. We think we are so spiritual because we read our Bibles, or regularly attend church, or give a tenth of all we make (use those calculators if you have any question) to the church.
We can be spritual snobs because we "know" something someone else doesn't know. And we are soooo quick to point out that they don't know, are confused about the subject, make all the wrong assumptions about it, or simply cannot speak about the subject for their lack of "knowing" what we "know".
We can be spiritual snobs because we've experienced something others have not experienced--some mountain-top situation.
We can be spiritual snobs because we have suffered what another hasn't. We can think we have attained a higher level of understanding of God in our suffering. You know the folks who say, "Well, you think that's bad, let me tell you what I've been through."
It was Eve who ate forbidden fruit because Satan told her she would "know" what God knew if she ate it. Perhaps that is the key. If we think we are better, then we know we are not better. We are just priggish. selahV