Companies spend a lot of money on PR campaigns against them, companies like little Cesar’s force employees to watch videos denouncing unions, corporate media promotes profit not better wages, hence the uneven distribution in coverage. Companies like wal mart have entire teams dedicated to dismantling any union effort in any of their stores

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Worker's Unions are controversial because they can force the rich to give up some of their money. That means the owners will spend vast sums of money to eliminate the threat. Back in the day, on financier said that he could hire half the working class to kill the other half. It should be noted that most of the workers' rights that are common today came from Unions. The 40 hour work week, safety regulations, restrictions on child labor, equal pay for women, unemployment insurance, social security, and other things we take for granted were won with blood and struggle.

But why

It's primarily because corporations like Walmart are known for union-busting and create a fair amount of anti-union media to stir up controversy about them.

Unions aren't liked by big companies because it leads to better pay, stricter labor rules, and more benefits for workers, which translates to less profits for companies and their shareholders. Not having a union also allows companies to be a lot harsher on employees because there is little risk of an organized strike.

Union shops are also prone to following strict rules like shift ends, overtime, and who is allowed to do what, which can be incredibly frustrating when dealing with them.

It can make for an in-flexible organization making it very difficult to accomplish projects ahead of schedule or delivering excellence.

Unions can get in the way of hiring talented people from the outside in favor of promoting within, which is good for existing employees, but bad for the organization as a whole.

If you are a star employee you will often find yourself taking a backseat to long time employees. The Union favors seniority (gotta put in your time) and strict rules about pay grades, promotions, and seniority can hold back really talented peoples careers.

Unions are great for protecting the average worker, meaning they are great for mediocrity and large pools of average workers, but aren't so great for smaller companies and super talented employees that can do better at a more flexible company.

Unions exist to help secure better wages and conditions for workers. Corporations exist to make the most profit possible. Their goals are often, but not inherently, opposed. A worker looking for better pay or better benefits and a capital owner looking to expand their profits will likely have different views on unions.