I understand you don't see this verse as applying to Mary . . and without answering that issue, which is better done by us in OBOB, I just thought it might help to understand better how you see such use of a verse as an act of blasphemy. Are you sure blasphemy is the right word to express what you are seeing?
Here are some defintions of blasphemy from the web that came up in a google search . . Do any of these seem to you to fit how you are seeing this verse used?
blasphemous language (expressing disrespect for God or for something sacred)
[url]www.cogsci.princeton.edu/cgi-bin/webwn[/url]
blasphemous behavior; the act of depriving something of its sacred character; "desecration of the Holy Sabbath"
[url]www.cogsci.princeton.edu/cgi-bin/webwn[/url]
Injurious or abusive speech, especially that directed against God, one of the most serious of all sins. Israelites were punished with death by stoning for calling down evil upon God. (Exo 20:7)
bookshelf.info/wordlists/e/eec/www/=B.html
Swearing in the name of God, denying the existence of God, saying evil things about God, etc. One religion's affirmation of their God is another religion's blasphemy about their God.
[url]www.religioustolerance.org/gl_b.htm[/url]
Evil and reproachful language directed at God, the Virgin, the Saints or sacred objects. The blasphemy against the Holy Spirit is a mortal and unforgivable sin, because it presumes that Got's saving action in this particular case is impossible. (cf. Matt. 12: 31).
essenes.crosswinds.net/odict.htm
Speech or writing expressing contempt for God.
[url]www.datarat.net/DR/Lex-B.html[/url]
Speaking evil of God or denying Him some good which we should attribute to Him. Blasphemy of the Holy Spirit is stating that Jesus did his miracles by the power of the devil (Matt. 12:22-32) and is an unforgivable sin (Mark 3:28-30). Blasphemy arises out of pride (Ps. 73:9,11), hatred (Ps. 74:18), injustice (Is. 52:5), etc. Christ was mistakenly accused of blasphemy (John 10:30-33).
[url]www.sullivan-county.com/identity/dictionary/dic_a-b.htm[/url]
Words that are spoken against God.
[url]www.geocities.com/brentwoodursuline/dictionary.htm[/url]
To reproach or to bring a railing accusation against any one is bad enough (Jude 9), but to speak lightly or carelessly of God is a mortal sin. The third commandment, "You shall not misuse the name of the LORD your God" (Exod 20:7), was observed so meticulously by the Jews that they would not speak the sacred name (Jehovah) at all, and so no one knows today for certain how it was pronounced. Christian - The biblical meaning is "adherent of Christ." The disciples were formally called Christians first in Antioch (Acts 11:26). Agrippa recognized that to believe what Paul preached would make him a Christian (26:28). Peter accepted the name as in itself a basis for persecution (1 Peter 4:16). The apostles wrote of themselves as servants (slaves) of Christ (Rom 1:1; James 1:1; 2 Peter 1:1; Jude 1; Rev 1:1).
[url]www.knowyourscripture.com/helpful_definitions.htm[/url]