You're going to avoid AC because of something that UA did?
So are you also going to avoid:
Aer Lingus
Aeromar
Air China
Air Dolomiti
Air New Zealand
ANA
Asiana Airlines
Austrian Airlines
Avianca
Avianca Brazil
Azul Brazilian Airlines
Brussels Airlines
Cape Air
Copa Airlines
Croatia Airlines
EgyptAir
Ethiopian Airlines
Eurowigs
EVA Air
Germanwings
Great Lakes Airlines
Hawaiian Airlines
Island Air
Jet Airways
LOT Polish Airlines
Lufthansa
Scandinavian Airlines
Silver Airways
Singapore Airlines
South African Airways
Swiss International Air Lines
TAP Portugal
Turkish Airlines
And since you're worried about being re-routed, and since the following airlines have bought tickets for re-routed pax on United, I assume you will also avoid:
Delta
American Airlines
Alaska Airways
Allegiant
Frontier
Jetblue
Southwest
I hope the answer is yes you will avoid all of these because if you won't that would be hypocritical