Cecil Moore wrote:

What really gets my dander up are the gurus who use their
respected guru status to mount ad hominem attacks against
someone who they know is technically correct. In my book,
that is unethical behavior.

Cecil:

Which definition of Guru comes closest to your implied meaning:
(BTW, I think your use of "guru" is well justified)

# (Literally the word guru means teacher) Second level of its meaning is
that the guru is a spiritual leader, a saint, a Enlightener. GU
(darkness) RU (light); One who brings light into darkness. A teacher..
However, the meaning of the word Guru in Sikh terminology is at a
further higher level, and it stands for the 'prophet'.
www.sikhlink.com/sikh/terms.htm

# ("he who is heavy, weighty"): a spiritual teacher; cf. acarya
www.yogajournal.com/newtoyoga/159.cfm

# a religious percept or teacher, often the person from whom one
receives initiation or consecration.
www.trimondi.de/SDLE/Glossary.htm

# Literally teacher refers to one of the ten Sikh prophets, the Sikh
scripture (Guru Granth Sahib), or God.
www.sikhstudy.com/A7terms.html

# In general terms, a computer expert. UNIX experts are typically
referred to as gurus in polite company.
teladesign.com/ma-thesis/glossary.html

# a teacher who has attained mastery in the Supracosmic Sphere.
www.mudrashram.com/glossarypage.html

# "Remover of darkness;" guide. A teacher. Though it can connote a
teacher of any subject, guru usually denotes a spiritual teacher or master.