Nope. This opinion perpetrated by perhaps millions of wrongly taught Christians, is still just an opinion passed down like any other cult, and false religion. There is nothing in Scripture that implies nor explicitly states this false assumption and presupposition.
That is not how they are portrayed by John in the few verses that they are even mentioned.
Need I remind you that the Johavah's Witnesses tried to declare themselves the church and the 144k representing the church of all nations on earth? That is what you claim about these 144k, even if you don't think they are literal people, but represent all the redeemed of mankind.
They are a literal 1200 from the named tribes as much as Jesus is a literal human of one of the 12 tribes. They serve Jesus, and follow Him everywhere He goes per Revelation 14. If you symbolize the 144k, you have to symbolize Jesus, that He is not a literal human. They may represent God on the earth, and will do so for the next millenia, but contrary to your false teaching, they are literal humans, no longer bound in Adam's dead corruptible flesh, but redeemed and enjoying God's permanent incorruptible physical body per Paul in 2 Corinthians 5:1 and 1 Corinthians 15:52. They are sealed on the earth after the Second Coming, after the church is glorified and waiting in Paradise.
They are dead in their sinful flesh, and the angels change them per the seal placed in their foreheads, out of death, into everlasting life and righteousness. Romans 11:26-27
"And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob: For this is my covenant unto them, when I shall take away their sins."
This verse can only take place at the Second Coming, the 6th Seal, and that is when the 144k are redeemed on the earth to go through Jacob's trouble, while the majority of Isreal will be tossed into the LOF as goats. The goats ethnicity will not save them. Only a remnant are saved called the sheep in Matthew 25, along with the 144k. Election is not based on ethnicity, but the necessity of Adam and Eve's offspring to be redeemed. That Paul states clearly: physically born of Jacob, whom God named Israel, were natural branches, in no way makes God racist. They were natural branches under the Covenant given on Mount Sinai between God and Israel. All outside of physical Israel could be spiritually grafted in since Mount Sinai, by for lack of a better word, being "converted" into the Law.
Since the Cross, all mankind is converted into the second birth, via submission to the Holy Spirit. Israel was blinded in part, and their status as natural branches taken away. That put them at enmity per the gospel, but not according to election. It was the offspring of Jacob who had issues. Those redeemed since then should not be the ones going around crying racism and ethnic based redemption. That is a deception of Satan, just to stir up division in the body of Christ.
Changing what John wrote in Revelation 7 and turning those words into your own theological eschatology, and then accusing those in Christ of racism is carnal and at enmity with God.