Should we respect all of Mankind? Did King Saul deserve David's respect (1 Samuel 24)? Do we continue to respect our parents even if they treat us bad? What about our bosses at work? Do we treat our bosses with respect if they treat us bad (1 Peter 2:18-21; 1 Timothy 6:1)? What about congregational leaders or elders? Should we treat them with respect if they treat us bad? Do we have a right to execute vengeance upon someone else or is that God's responsibility (Romans 12:19-21)?
"Honour all men. Love the brotherhood. Fear God. Honour the king." (1 Peter 2:17 KJV)
"Honour" is translated "Respect" in other translations of the Bible.
"Show respect for all men [treat them honorably]. Love the brotherhood (the Christian fraternity of which Christ is the Head). Reverence God. Honor the emperor." (1 Peter 2:17 AMP)
Honour - Strongs No: G5091
"(I) To esteem (value or worth - emphasis mine), honor, reverence, with the acc.
(A) Generally (1Ti_5:3); especially of parents (Mat_15:4, Mat_15:6; Mat_19:19; Mar_7:10; Mar_10:19; Luk_18:20; Eph_6:2; Sept.: Exo_20:12; Deu_5:16); everyone, kings (1Pe_2:17); God and Christ (Joh_5:23; Joh_8:49); of feigned piety toward God and Christ (Mat_15:8; Mar_7:6 quoted from Isa_29:13; Pro_3:9).
(B) To treat with honor, to bestow special marks of honor and favor upon someone, with the acc. (Joh_12:26; Act_28:10)." (The Complete WordStudy Dictionary)