Is benzene acidic? It has $sp^2$ hybridization so doen it mean that it is acidic in nature? Are alkenes acidic?
A sp2-hybridized carbon is more electronegative than an sp3-hybridized carbon, and you would expect it to be more acidic.
Experiments support this prediction. Benzene has a pKa of ~ 43, compared to alkanes, which have a pKa of ~ 50. You can prepare lithioaromatics from bromo/iodoaromatics and butyllithium via metal-halogen exchange.
The situation with alkenes is slightly more complicated; the pKa of vinylic protons is in the same ballpark as of aromatic protons, but allylic protons are slighty more acidic.