After all you're hiring yourself out to write about their topic of discussion.
One way to avoid ruffling your feathers is to, research a writing job before you accept it. Don't tie yourself to writing about a subject you hate and can't present at 100%. Your quality of work could reflect your "attitude" towards the assignment, if it isn't something you like. Word of mouth spreads quickly, good or bad people will come to know who you are as a freelance writer. Look before you leap.
Still, taking pride in what you write and having a passion for it should be owned by you!
Here's a glimpse at my passion for the pen! (Literal, digital or otherwise.
Scribbling furiously my nib takes flight.
Snap, tapping motion of fluid release.
Words gather quickly preparing delight.
Rasping pen echoes, fulfilling increase.
If spoken, decreases intended bite,
disquiet then creeps in to intrusive views.
Impairing motion of pens' truest cite,
leaving me waiting your harshest reviews.
White pages become littered with inks plight.
Dueling lines pleading for dominant space.
Once chosen, dipped ink, is set to new heights.
Showing no evidence of struggles trace.
When all agree, ink, pen, paper and I,
what challenges come I'll release through flight.